<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>js文件的引入</title>
	<!-- 内部的js -->
	<script type="text/javascript">
		// 编写js代码
		alert('我是mjj');
	</script>
	<!-- 外部的js -->
	<script type="text/javascript" src='js/index.js'></script>
</head>
<body>
	
</body>
</html>